MRI of the Right Fallopian Tube: Indications, Findings, and Interpretation

Why Order Pelvic MRI for Fallopian Tube Evaluation?

MRI provides superior soft-tissue contrast vs. ultrasound for complex pelvic pathology. Specific indications for right tube focus:

1. Pelvic Pain / Adnexal Mass Characterization

• Distinguish tubal vs. ovarian vs. uterine origin.
• Hydrosalpinx (fluid-filled tube): T2-hyperintense, tubular, "beads-on-string" or sausage-shaped.
• Pyosalpinx (pus): thick walls, debris, restricted diffusion.
• Hematosalpinx (blood): T1/T2 signal varies with blood age.

2. Infertility Workup

• Tubal patency: MR hysterosalpingography (MR-HSG) – non-invasive, no radiation.
• Peritubal adhesions, endometriosis implants on serosa.
• Congenital anomalies: absent/hypoplastic tube, unicornuate uterus with solitary tube.

3. Suspected Ectopic Pregnancy

• When ultrasound is inconclusive (e.g., interstitial, cervical, cesarean scar pregnancy).
• MRI: gestational sac, trophoblastic ring, hemoperitoneum without radiation.

4. Post-Tubal Ligation Assessment

• Confirm occlusion, identify fistulas, recanalization.
• Evaluate for tubal ectopic after sterilization.

5. Malignancy Staging

• Primary fallopian tube carcinoma (rare; high-grade serous).
• Metastatic involvement from ovary, uterus, colon, appendix.

Interpretation Requires Expertise

Read by radiologist with pelvic MRI specialization, correlated with clinical history, labs (β-hCG, CA-125), and prior imaging. Multidisciplinary discussion (gyn, REI, onc) optimizes management.